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        <p>In last post we have installed lighttpd and fastcgi++, it’s create a demo page to have a quick verification.</p>
<a id="more"></a>


<h2 id="A-simple-html"><a href="#A-simple-html" class="headerlink" title="A simple html"></a>A simple html</h2><p>Let’s write a simple html for demo:</p>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">html</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">html</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">head</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">meta</span> <span class="attr">charset</span>=<span class="string">'utf-8'</span> /&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">link</span> <span class="attr">rel</span>=<span class="string">"icon"</span> <span class="attr">href</span>=<span class="string">"/img/favicon.ico"</span> <span class="attr">type</span>=<span class="string">"img/x-ico"</span> /&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">title</span>&gt;</span>Alex Demo page<span class="tag">&lt;/<span class="name">title</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">head</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">body</span> <span class="attr">background</span>=<span class="string">"/img/back.jpg"</span></span></span><br><span class="line"><span class="tag">    <span class="attr">style</span>=<span class="string">" background-repeat:no-repeat ;background-size:100% 100%;background-attachment: fixed;"</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">div</span> <span class="attr">align</span>=<span class="string">"center"</span> <span class="attr">style</span>=<span class="string">"margin-top: 25%"</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">form</span> <span class="attr">id</span>=<span class="string">"diag"</span> <span class="attr">action</span>=<span class="string">"/cpp_get.fcgi"</span> <span class="attr">method</span>=<span class="string">"get"</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">table</span> <span class="attr">border</span>=<span class="string">"0"</span> <span class="attr">style</span>=<span class="string">"background-color:dimgrey"</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">tr</span>&gt;</span></span><br><span class="line">                    <span class="tag">&lt;<span class="name">td</span> <span class="attr">align</span>=<span class="string">"right"</span> <span class="attr">valign</span>=<span class="string">"middle"</span>&gt;</span></span><br><span class="line">                        Product Name:<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">" text"</span> <span class="attr">name</span>=<span class="string">"product_name"</span> /&gt;</span><span class="tag">&lt;<span class="name">br</span> /&gt;</span></span><br><span class="line">                        Product ID:<span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"text"</span> <span class="attr">name</span>=<span class="string">"product_id"</span> /&gt;</span><span class="tag">&lt;<span class="name">br</span> /&gt;</span></span><br><span class="line">                        <span class="tag">&lt;<span class="name">input</span> <span class="attr">type</span>=<span class="string">"submit"</span> <span class="attr">value</span>=<span class="string">"提交"</span> /&gt;</span></span><br><span class="line">                    <span class="tag">&lt;/<span class="name">td</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;/<span class="name">tr</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">table</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">form</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">body</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">html</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>This page will show a picture as page background, meanwhile a from will be created for testing GET method. The path we are using in html is relative path, i.e. if you put your pages to <em>/var/www/pages/test.html</em>, the absolute path of back.jpg will be <em>/var/www/pages/img/back.jpg</em> and the relative path will be <em>/img/back.jpg</em>.</p>
<p>Beware of access rights of those files/directories, the user and user group of lighttpd was configured in <strong>lighttpd.conf</strong> by <strong>server.username</strong> and <strong>server.groupname</strong>. Make sure lighttpd can access them.</p>
<h2 id="Write-a-simple-fgci-backend"><a href="#Write-a-simple-fgci-backend" class="headerlink" title="Write a simple fgci backend"></a>Write a simple fgci backend</h2><figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// fcgi_get.cpp</span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;fastcgi++/request.hpp&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;iomanip&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;fstream&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">GetTest</span> :</span> <span class="keyword">public</span> Fastcgipp::Request&lt;<span class="keyword">wchar_t</span>&gt;</span><br><span class="line">&#123;</span><br><span class="line">    <span class="function"><span class="keyword">bool</span> <span class="title">response</span><span class="params">()</span></span></span><br><span class="line"><span class="function">    </span>&#123;</span><br><span class="line"></span><br><span class="line">        <span class="built_in">std</span>::<span class="function">wofstream <span class="title">outPutFile</span><span class="params">(<span class="string">"output.patch"</span>, <span class="built_in">std</span>::ios_base::out | <span class="built_in">std</span>::ios_base::binary)</span></span>;</span><br><span class="line">        <span class="comment">//! [Response definition]</span></span><br><span class="line">        <span class="comment">//! [HTTP header]</span></span><br><span class="line">        out &lt;&lt; <span class="string">L"Content-Type: text/html; charset=utf-8\r\n\r\n"</span>;</span><br><span class="line">        <span class="comment">//! [HTTP header]</span></span><br><span class="line"></span><br><span class="line">        <span class="comment">//! [Output]</span></span><br><span class="line">        out &lt;&lt; <span class="string">L"&lt;!DOCTYPE html&gt;\n"</span></span><br><span class="line">               <span class="string">L"&lt;html&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;head&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;meta charset='utf-8' /&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;title&gt;Success&lt;/title&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;/head&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;body&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;p&gt;"</span>;</span><br><span class="line">        <span class="keyword">using</span> Fastcgipp::Encoding;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (!environment().gets.empty())</span><br><span class="line">            <span class="keyword">for</span> (<span class="keyword">const</span> <span class="keyword">auto</span> &amp;get : environment().gets)</span><br><span class="line">            &#123;</span><br><span class="line">                out &lt;&lt; <span class="string">L"&lt;b&gt;"</span> &lt;&lt; Encoding::HTML &lt;&lt; get.first &lt;&lt; Encoding::NONE</span><br><span class="line">                    &lt;&lt; <span class="string">L":&lt;/b&gt; "</span> &lt;&lt; Encoding::HTML &lt;&lt; get.second</span><br><span class="line">                    &lt;&lt; Encoding::NONE &lt;&lt; <span class="string">L"&lt;br /&gt;"</span>;</span><br><span class="line">                outPutFile &lt;&lt; get.first &lt;&lt; <span class="string">":"</span> &lt;&lt; get.second;</span><br><span class="line">            &#125;</span><br><span class="line"></span><br><span class="line">        out &lt;&lt; <span class="string">L"&lt;/p&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;/body&gt;"</span></span><br><span class="line">               <span class="string">L"&lt;/html&gt;"</span>;</span><br><span class="line">        <span class="comment">//! [Output]</span></span><br><span class="line"></span><br><span class="line">        <span class="comment">//! [Return]</span></span><br><span class="line">        outPutFile &lt;&lt; <span class="string">"FFF"</span> &lt;&lt; <span class="built_in">std</span>::<span class="built_in">endl</span>;</span><br><span class="line">        outPutFile.close();</span><br><span class="line">        <span class="keyword">return</span> <span class="literal">true</span>;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="meta-keyword">include</span> <span class="meta-string">&lt;fastcgi++/manager.hpp&gt;</span></span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">main</span><span class="params">()</span></span></span><br><span class="line"><span class="function"></span>&#123;</span><br><span class="line">    Fastcgipp::Manager&lt;GetTest&gt; manager;</span><br><span class="line">    <span class="comment">//! [Manager]</span></span><br><span class="line">    <span class="comment">//! [Signals]</span></span><br><span class="line">    manager.setupSignals();</span><br><span class="line">    <span class="comment">//! [Signals]</span></span><br><span class="line">    <span class="comment">//! [Listen]</span></span><br><span class="line">    manager.listen();</span><br><span class="line">    <span class="comment">//! [Listen]</span></span><br><span class="line">    <span class="comment">//! [Start]</span></span><br><span class="line">    manager.start();</span><br><span class="line">    <span class="comment">//! [Start]</span></span><br><span class="line">    <span class="comment">//! [Join]</span></span><br><span class="line">    manager.join();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>Use <em>environment().gets</em> to get all data passed by frontend through GET method.</p>
<h2 id="Compile-your-fcgi"><a href="#Compile-your-fcgi" class="headerlink" title="Compile your fcgi"></a>Compile your fcgi</h2><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">g++ fcgi_get.cpp -lfastcgipp -o cpp_get.fcgi</span><br></pre></td></tr></table></figure>

<p>Then copy it to <em>/var/www/fcgi-bin/cpp_get.fcgi</em>. Don’t forget add rights of execution for this fcgi file.</p>
<h2 id="Add-your-fcgi-into-lighttpd-conf"><a href="#Add-your-fcgi-into-lighttpd-conf" class="headerlink" title="Add your fcgi into lighttpd conf"></a>Add your fcgi into lighttpd conf</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">&quot;&#x2F;cpp_get.fcgi&quot; &#x3D;&gt; (</span><br><span class="line">  &quot;cpp_get.fastcgi.handler&quot; &#x3D;&gt; (</span><br><span class="line">    &quot;socket&quot; &#x3D;&gt; &quot;&#x2F;var&#x2F;run&#x2F;lighttpd&#x2F;lighttpd-cpp_get-&quot; + PID + &quot;.socket&quot;,,</span><br><span class="line">    &quot;check-local&quot; &#x3D;&gt; &quot;disable&quot;,</span><br><span class="line">    &quot;bin-path&quot; &#x3D;&gt; &quot;&#x2F;var&#x2F;www&#x2F;fcgi-bin&#x2F;cpp_get.fcgi&quot;,</span><br><span class="line">    &quot;max-procs&quot; &#x3D;&gt; 30,</span><br><span class="line">  )</span><br><span class="line">)</span><br></pre></td></tr></table></figure>

<p>This configuration allows you execute your fcgi by access localhost/cpp_get.fcgi.</p>
<h2 id="Apply-changes"><a href="#Apply-changes" class="headerlink" title="Apply changes"></a>Apply changes</h2><p>If lighttpd is already started on your device, you might need to restart lighttpd services to apply changes: </p>
<figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">service lighttpd force-reload</span><br></pre></td></tr></table></figure>

<h2 id="Verification"><a href="#Verification" class="headerlink" title="Verification"></a>Verification</h2><p>Open <em><a href="http://localhost/test.html" target="_blank" rel="noopener">http://localhost/test.html</a></em>, input something in the form then click “提交”, if everything is ok, browser will jump to <em><a href="http://localhost/cpp_get.fcgi" target="_blank" rel="noopener">http://localhost/cpp_get.fcgi</a></em> and show what you have inputted. Meanwhile a file called <em>output.patch</em> will be generated at your page folder which contains the text you inputted as well.</p>
<p>Tips: If error occurred, you can find the path of error log by checking the value of <strong>server.errorlog</strong> in your <strong>lighttpd.conf</strong>.</p>

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